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Subject has not been treated for an active opportunistic infection within 30 days of the baseline visit.

Subject Has a Karnofsky Score greater than or equal to 70.

Subject does not require and agrees not to take, for the duration of the study, any of the following medications that are contraindicated with Kaletra: astemizole, terfenadine, midazolam, triazolam, cisapride, certain ergot derivatives (ergotamine, dihydroergotamine, ergonovine, and methylergonovine), pimozide, propafenone and flecainide. Rifampin, a potent enzyme inducer, should not be administered with the study medication, because of the possibility of significant decreases in Kaletra concentration during concurrent administration.

The subject agrees not to take any medication, including over-the-counter medicine, alcohol, recreational drugs or herbal preparations without the knowledge and permission of the principal investigator.